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Real-world Treatment Patterns and Effectiveness of Palbociclib and AI Therapy

CompletedN/A

Sponsor: Pfizer

Conditions: Metastatic Breast Cancer

Interventions: Palbociclib + an aromatase inhibitor, Palbociclib + Letrozole, Letrozole

Countries: United States

A retrospective observational analysis of de-identified Flatiron Health Analytic Database to describe patient characteristics, treatment patterns and effectiveness of Palbociclib + AI as first-line therapy in HR+/HER2- metastatic breast cancer (MBC) in the US clinical practices.

Eligibility overview

Sex: FEMALE

Age: 18 Years to —

Healthy volunteers: No

Study type: OBSERVATIONAL

Eligibility criteria

Inclusion Criteria:

1. Female sex
2. At least 18 years old at MBC diagnosis
3. Diagnosis of MBC at any point in patient history

   1. ICD-9 (174.x, 175.x) or ICD-10 (C50.xx) diagnosis of BC
   2. Confirmation of metastatic disease
   3. At least 2 document clinical visits
   4. Evidence of stage IV or recurrent MBC with a metastatic diagnosis date on or after 2011, as confirmed by unstructured clinical documents
4. HR+/HER2-

   1. HR+: ER+ or PR+ test before or up to 60 days after MBC diagnosis
   2. HER2-: any HER2 negative test and the absence of a positive test (IHC positive 3+, FISH positive/amplified, Positive NOS) before or up to 60 days after MBC diagnosis
5. Palbociclib + AI or letrozole as first-line therapy for MBC during the period from February/2015 through August /31/2018 (or 3 months prior to study cut-off date) to allow for a possible minimum follow-up time of 90 days until the study cutoff date. AI was administered within (±) 28 days of Palbociclib index date.

Exclusion Criteria:

1. Evidence of prior treatment with other CDK4/6I (Ribociclib or Abemaciclib), AI (Letrozole, Exemestane, and Anastrazole), Tamoxifen, Raloxifene, Toremifene, or Fulvestrant for MBC
2. First structured activity greater than 90 days after MBC diagnostic date
3. Treatment with a CDK4/6 inhibitor as part of a clinical trial

Locations (1)

New York, New York, United States